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CN111287870A - Exhaust gas recirculation cooler - Google Patents

Exhaust gas recirculation cooler Download PDF

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Publication number
CN111287870A
CN111287870A CN201910823346.4A CN201910823346A CN111287870A CN 111287870 A CN111287870 A CN 111287870A CN 201910823346 A CN201910823346 A CN 201910823346A CN 111287870 A CN111287870 A CN 111287870A
Authority
CN
China
Prior art keywords
exhaust gas
inlet
outlet
gas recirculation
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910823346.4A
Other languages
Chinese (zh)
Inventor
杨一锡
洪龙豹
李承勋
任正赫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Publication of CN111287870A publication Critical patent/CN111287870A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

An EGR cooler includes a cylinder block having an installation space and having a coolant inlet through which coolant may flow into the installation space and a coolant outlet through which the coolant may be discharged. The cover plate covers the installation space and forms an exhaust gas inlet through which exhaust gas may flow in and an exhaust gas outlet through which exhaust gas may be discharged. A pipe is installed in the installation space, and exhaust gas may flow through the pipe. The inlet box is installed in the installation space and configured to distribute the exhaust gas flowing through the exhaust gas inlet of the cap plate to the tubes. The outlet box is installed in the installation space and configured to guide the exhaust gas discharged from the tubes to an exhaust gas outlet of the cover plate.

Description

Exhaust gas recirculation cooler
Technical Field
The present invention relates to an Exhaust Gas Recirculation (EGR) cooler, and in particular embodiments, to an EGR cooler mounted at a cylinder block.
Background
An Exhaust Gas Recirculation (EGR) system is a system installed in a vehicle to reduce harmful exhaust gas.
In general, NO when the air ratio in the mixer is high and combustion is goodxAnd (4) increasing. Thus, an EGR system is a system for remixing a portion (e.g., 5% to 20%) of exhaust gas emitted from an engine in a mixer to reduce the amount of oxygen in the mixer and to retard combustion, thereby suppressing NOxIs present.
Generally, since exhaust gas discharged from an engine has a very high temperature, an EGR system has an EGR cooler to reduce the temperature of recirculated exhaust gas.
The related art EGR cooler includes a cooling structure installed in a separate housing, requires various components (such as a joint, etc.) for connecting a recirculation line through which recirculation gas flows to the outside of the housing, and causes high vehicle manufacturing costs due to an increase in the length of the recirculation line.
Also, since it is difficult to firmly fix the EGR cooler in the vehicle, the EGR cooler housing swings when the vehicle runs, causing excessive vibration.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art in this country.
Disclosure of Invention
Embodiments of the present invention may provide an Exhaust Gas Recirculation (EGR) cooler having advantages of reducing vehicle manufacturing costs.
Embodiments of the present invention may also provide an EGR cooler having an advantage of reducing vibration caused when a vehicle is running.
An EGR (exhaust gas recirculation) cooler according to an exemplary embodiment of the present invention may include a cylinder block having an installation space and having a coolant inlet through which coolant may flow into the installation space and a coolant outlet through which the coolant may be discharged. The cover plate covers the installation space and forms an exhaust gas inlet through which exhaust gas flows in and an exhaust gas outlet through which exhaust gas is discharged. A plurality of pipes are installed in the installation space. Exhaust gas flows in the pipe. An inlet box is installed in the installation space and distributes the exhaust gas flowing through the exhaust gas inlet of the cover plate to the tubes. The outlet box is installed in the installation space and guides the exhaust gas discharged from the tubes to the exhaust gas outlet of the cover plate.
The plurality of tubes may be stacked in the left-right direction and the up-down direction. At least one spacer (spacer) may be formed on the outer surface of the tube to maintain a constant distance between the plurality of tubes.
An inlet manifold (header) forming a plurality of pipe inlet holes corresponding to the plurality of pipes may be interposed between the plurality of pipes and the inlet box, and the exhaust gas may be distributed from the inlet box to the plurality of pipes.
An outlet manifold forming a plurality of pipe outlet holes corresponding to the plurality of pipes may be interposed between the plurality of pipes and the outlet tank, and the exhaust gas may be discharged from the plurality of pipes to the outlet tank.
An inlet tank hole communicating with the exhaust gas inlet of the cover plate and a manifold inlet insertion portion for installing an inlet manifold may be formed in the inlet tank.
A manifold outlet insert part for mounting the outlet manifold and an outlet tank hole communicating with the exhaust gas outlet of the cover plate may be formed in the outlet tank.
A cover bent portion bent toward the opposite side of the cylinder block may be formed on the outer side of the cover plate.
The guide protrusion may be formed to guide the flow of the coolant, and the guide protrusion may be formed to protrude toward the installation space.
The plurality of protrusions may protrude toward opposite sides of the installation space so as to prevent noise generated at the engine from being transmitted to the outside.
The EGR cooler may further include a gasket disposed between the cover plate and the cylinder block.
The EGR cooler may further include: an inlet duct installed in the exhaust gas inlet of the cap plate; and an outlet duct installed in the exhaust gas outlet of the cover plate.
The inlet duct and the outlet duct may be formed in a bellows shape having corrugations.
The EGR cooler may further include: an inlet flange mounted to the inlet duct; and an outlet flange mounted to the outlet duct.
According to the exemplary embodiments of the present invention as described above, the cover plate, the inlet tank, and the outlet tank, which are manufactured through the pressing process, are assembled by welding, thereby simplifying the structure of the EGR cooler and reducing the material cost and the total weight.
Drawings
The drawings are used as references in describing exemplary embodiments of the present invention, and thus the technical idea of the present invention should not be construed to limit the present invention to the drawings.
Fig. 1 is a view showing the configuration of an engine system to which an Exhaust Gas Recirculation (EGR) cooler according to an exemplary embodiment of the invention is applied.
Fig. 2 is a partial perspective view illustrating the configuration of a cylinder block according to an exemplary embodiment of the present invention.
Fig. 3 is a perspective view illustrating an EGR cooler according to an exemplary embodiment of the present invention.
Fig. 4 is a perspective view illustrating an EGR cooler according to an exemplary embodiment of the present invention in a different direction.
Fig. 5 is an exploded perspective view illustrating an EGR cooler according to an exemplary embodiment of the present invention.
Fig. 6 is a perspective view illustrating a tube according to an exemplary embodiment of the present invention.
Fig. 7 is a perspective view illustrating a tank according to an exemplary embodiment of the present invention.
Fig. 8 is a perspective view illustrating a cap plate according to an exemplary embodiment of the present invention.
Fig. 9 is a perspective view illustrating an inlet duct or an outlet duct according to an exemplary embodiment of the present invention.
Fig. 10 is a perspective view illustrating an inlet duct or an outlet duct according to another exemplary embodiment of the present invention.
The following reference numerals may be used in conjunction with the accompanying drawings:
10: air intake line
20: engine
21: combustion chamber
30: cylinder block
31: installation space
33: coolant inlet
35: coolant outlet
40: waste gas line
50: exhaust gas recirculation device
52: EGR pipeline
54: EGR valve
60: catalytic converter
70: turbocharger
71: turbine wheel
72: compressor with a compressor housing having a plurality of compressor blades
100: EGR cooler
110: pipe
111: spacer member
120: inlet box
122: inlet box hole
124: manifold inlet insert
130: outlet box
132: outlet box hole
134: manifold outlet insert
140: inlet manifold
142: pipe inlet orifice
144: inlet manifold bend
150: outlet manifold
152: pipe outlet orifice
154: outlet manifold bend
160: cover plate
161: exhaust gas inlet
162: exhaust outlet
163: cover curved portion
165: protrusion
167: guide projection
169: cover joint hole
170: gasket
172: gasket joint hole
180: inlet and outlet pipes
182: brazing part
190: inlet flange, outlet flange
192: flange joint hole
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
In order to clarify the present invention, portions irrelevant to the description will be omitted, and like reference numerals will be used for like portions throughout the specification.
The size and thickness of each element are arbitrarily shown in the drawings, and the present invention is not necessarily limited thereto. In the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity.
First, an engine system to which an Exhaust Gas Recirculation (EGR) cooler according to an exemplary embodiment of the present invention is applied will be described with reference to fig. 1.
Fig. 1 is a view showing the configuration of an engine system to which an Exhaust Gas Recirculation (EGR) cooler according to an exemplary embodiment of the invention is applied.
As shown in fig. 1, an engine system to which an EGR cooler 100 according to an exemplary embodiment of the present invention is applied may include an engine 20 and an exhaust gas recirculation device 50.
The engine 20 includes a plurality of combustion chambers 21 for generating power required to drive the vehicle through combustion of fuel, and the engine 20 is connected to an intake line 10 through which intake air supplied to the combustion chambers 21 flows and an exhaust line 40 through which exhaust gas discharged from the combustion chambers 21 flows.
The exhaust gas line 40 is provided with a catalytic converter 60 for purifying various harmful substances contained in the exhaust gas discharged from the combustion chamber 21. The catalytic converter 60 may include a three-way catalytic converter (TWC).
The engine system of the present invention may further include a turbocharger 70 for compressing intake air supplied to the combustion chamber 21.
The turbocharger 70 compresses intake air (outside air + recirculated gas) flowing through the intake line 10 and supplies the compressed air to the combustion chamber 21. The turbocharger 70 includes a turbine 71 and a compressor 72, the turbine 71 being disposed in the exhaust gas line 40 and rotated by exhaust gas discharged from the combustion chamber 21, the compressor 72 rotating in cooperation with the turbine 71 and compressing intake air.
The exhaust gas recirculation arrangement 50 comprises an EGR line 52, an EGR cooler 100 and an EGR valve 54.
EGR line 52 branches from exhaust line 40 downstream of turbine 71 and couples to intake line 10 upstream of compressor 72. The EGR cooler 100 is disposed at the EGR line and cools the exhaust gas flowing through the EGR line 52. The EGR valve 54 is provided at a position where the EGR line and the intake line 10 are coupled and adjusts the amount of recirculated gas flowing to the intake line 10. Here, the exhaust gas supplied to the intake line 10 through the recirculation line 52 is referred to as recirculated gas.
As the exhaust gas recirculation apparatus 50, a low-pressure exhaust gas recirculation apparatus will be described as an example. However, the present invention is not limited thereto and may also be applied to a high-pressure exhaust gas recirculation apparatus.
Hereinafter, an EGR cooler according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 is a partial perspective view illustrating the configuration of a cylinder block according to an exemplary embodiment of the present invention. Fig. 3 is a perspective view illustrating an EGR cooler according to an exemplary embodiment of the present invention. Fig. 4 is a perspective view illustrating an EGR cooler according to an exemplary embodiment of the present invention in a different direction.
The EGR cooler 100 according to an exemplary embodiment of the present invention may include: a cover plate 160, the cover plate 160 covering an installation space formed in the cylinder block; a plurality of tubes 110, the plurality of tubes 110 being installed in the installation space; an inlet case 120, the inlet case 120 guiding the exhaust gas flowing in through the cover plate 160 to the plurality of tubes 110; and an outlet case 130, the outlet case 130 discharging the exhaust gas discharged from the plurality of pipes 110 to the outside of the cover plate 160.
Referring to fig. 2, a plurality of combustion chambers 21 are formed in a cylinder block 30, and a mounting space 31 is formed on the outside. A coolant inlet and a coolant outlet, which are in fluid communication with a water jacket (not shown), are formed inside the installation space.
Referring to fig. 3, in the installation space 31, a plurality of tubes 110 are stacked in the left-right direction and the up-down direction, and the installation space forms a closed space by a cover plate 160.
The pipe 110 is formed in a pipe shape having both ends opened to flow the exhaust gas therein, and may be formed in a hexahedral or cylindrical shape having a long length.
A coolant channel through which a coolant flowing through the coolant inlet port flows is formed between the plurality of tubes 110. That is, the coolant passages may be formed between the inside of the installation space and the corresponding tubes 110, between the adjacent tubes 110, and between the cap plate 160 and the respective tubes 110.
As shown in fig. 6, a spacer 111 may be formed on the outer surface of the tube 110 to maintain a constant distance between the plurality of tubes 110 stacked in the vertical direction. A plurality of spacers 111 may be formed, and the plurality of spacers 111 may be formed at predetermined intervals.
Referring to fig. 8, the cover plate 160 is formed in a substantially quadrangular plate shape, and an exhaust gas inlet 161 through which exhaust gas flows is formed at one side of the cover plate 160, and an exhaust gas outlet 162 through which exhaust gas is discharged is formed at the other side of the cover plate 160. The cover plate 160 may be manufactured by stamping a metal plate.
A head bending part 163 is formed on the outer side of the cap plate 160, and the head bending part 163 is bent toward the opposite side of the cylinder block. The cover bent portion 163 serves to enhance the rigidity of the cover plate 160.
A plurality of protrusions 165 are formed at a central portion of the cover plate 160, and the plurality of protrusions 165 protrude toward opposite sides of the mounting space of the cylinder block. The plurality of protrusions 165 prevent noise generated at the engine from being transmitted to the outside.
In detail, when the coolant flows through the coolant passage formed between the cap plate 160 and the tube 110, a flow rate change occurs by the protrusion 165. Therefore, noise generated when the coolant passes through the coolant passage is reduced, and the noise is not transmitted to the outside.
Guide protrusions 167 are formed at both sides of the protrusion 165 to guide the flow of the coolant in the installation space. The guide protrusions 167 serve to maintain the interval of the coolant passages formed between the cap plate 160 and the tubes 110 adjacent to the cap plate 160 to be non-uniform. Accordingly, the guide protrusions 167 vary the pressure of the coolant flowing through the coolant passage formed between the cap plate 160 and the tube 110, thereby varying the flow rate of the coolant flowing through the coolant passage.
Meanwhile, a cover engagement hole 169 is formed on the cover plate 160, and a cylinder engagement hole corresponding to the cover engagement hole 169 is formed on the mounting space 31. After the cap plate 160 is seated in the cylinder block, an engagement bolt passing through the cap engagement hole 169 is screwed into the cylinder block engagement hole to couple the cap plate 160 and the cylinder block.
A gasket 170 is installed between the cover plate 160 and the cylinder block to close and seal the mounting space 31 of the cylinder block 30 from the outside, thereby preventing the coolant flowing in the mounting space from leaking to the outside. A gasket engagement hole 172 corresponding to the cover engagement hole 169 of the cover plate 160 is formed in the gasket 170.
The exhaust gas flowing through the exhaust gas inlet 161 of the cover plate 160 is distributed to the plurality of tubes 110 through the inlet box 120. At this time, the inlet manifold 140 is interposed between the inlet box 120 and the plurality of tubes 110, and the exhaust gas passing through the inlet box 120 is distributed to the plurality of tubes 110.
The exhaust gas passing through the plurality of tubes 110 is guided by the outlet case 130 and discharged to the outside through the exhaust gas outlet 162 of the cover plate 160. At this time, the outlet manifold 150 is interposed between the plurality of tubes 110 and the outlet tank 130, and the exhaust gas passing through the plurality of tubes 110 is collected into the outlet tank 130.
Referring to fig. 7, the inlet case 120 is formed as an empty polygonal body, an inlet case hole 122 communicating with the exhaust gas inlet 161 of the cap plate 160 is formed at one side of the inlet case 120, and a manifold inlet insert part 124 for mounting the inlet manifold 140 is formed at the other side of the inlet case 120. The inlet case 120 and the cap plate 160 may be fixed by brazing.
A plurality of tube inlet holes 142 corresponding to the tubes 110 are formed in the inlet manifold 140, and an inlet manifold bent portion 144 is formed at the outside of the inlet manifold 140 so as to be inserted into the manifold inlet insertion portion 124. The plurality of tube inlet holes 142 may be formed in a quadrangular or circular shape according to the shape of the end of the tube 110. The inlet manifold bend 144 is inserted into the manifold inlet insert portion 124 of the inlet box 120 to assemble the inlet manifold 140 and the inlet box 120.
Referring to fig. 7, the outlet tank 130 may have the same shape as the inlet tank 120. That is, the outlet box 130 is formed as an empty polygonal object, a manifold outlet insertion portion 134 for mounting the outlet manifold 150 is formed at one side of the outlet box 130, and an outlet box hole 132 communicating with the exhaust gas outlet 162 of the cover plate 160 is formed at the other side of the outlet box 130. The outlet slot 130 and the cover plate 160 may be secured by brazing.
The outlet manifold 150 may have the same shape as the inlet manifold 140. That is, a plurality of tube outlet holes 152 corresponding to the tubes 110 are formed in the outlet manifold 150, and an outlet manifold bending part 154 is formed at the outside of the outlet manifold 150 so as to be inserted into the manifold outlet insertion part 134. The plurality of tube outlet holes 152 may be formed in a quadrangular or circular shape according to the shape of the end of the tube 110.
The outlet manifold bend 154 is inserted into the manifold outlet insert section 134 of the outlet box 130 to assemble the outlet manifold 150 and the outlet box 130.
In this way, the inlet tank 120 and the outlet tank 130 are formed in the same shape, and the inlet manifold 140 and the outlet manifold 150 are formed in the same shape, thereby reducing the manufacturing cost.
The EGR line is provided in the exhaust gas inlet 161 of the cover plate 160. The EGR line is assembled to the inlet and outlet pipes through the inlet and outlet flanges.
In detail, the cylindrical inlet duct 180 is fixedly installed in the exhaust gas inlet 161 of the cap plate 160, and the cylindrical exhaust gas duct 180 is fixedly installed at the exhaust gas outlet 162. The inlet duct 180 and the outlet duct 180 may be fixed to the exhaust gas inlet 161 and the exhaust gas outlet 162 by brazing.
For this purpose, the inlet duct 180 and the outlet duct 180 may have brazed portions 182 formed at radially outwardly extending ends thereof (see fig. 9). The brazing portion 182 contacts the outside of the exhaust gas inlet 161 and the exhaust gas outlet 162, and the cap plate 160, the inlet duct 180, and the outlet duct 180 are fixed by brazing.
The bodies of the inlet and outlet conduits 180, 180 may be formed in a bellows shape having corrugations 184 (see fig. 10). By forming the inlet duct 180 and the outlet duct 180 in a bellows shape, vibration resistance characteristics of the inlet duct 180 and the outlet duct 180 may be improved and thermal fatigue characteristics may be improved.
The inlet duct 180 and the outlet duct 180 may be formed in the same shape. Therefore, by using the inlet duct 180 and the outlet duct 180 having the same shape, the manufacturing cost can be reduced.
The inlet and outlet flanges 190, 190 are fixedly mounted to the ends of the inlet and outlet ducts 180, respectively. The EGR lines are fixedly mounted to the inlet flange 190 and the outlet flange 190, respectively. The inlet flange 190 and the outlet flange 190 may be formed in the same shape. Therefore, by using the inlet flange 190 and the outlet flange 190 having the same shape, the manufacturing cost may be reduced.
Flange coupling holes 192 are formed on both sides of the inlet flange 190 and the outlet flange 190, and the EGR line is assembled through the flange coupling holes 192.
Hereinafter, the operation of the EGR cooler according to the exemplary embodiment of the present invention as described above will be described in detail.
Exhaust gas flowing through the EGR line is caused to flow into the exhaust gas inlet 161 of the cover plate 160 via the inlet flange 190 and the inlet conduit 180. The exhaust gas flowing into the exhaust gas inlet 161 of the cap plate 160 is distributed to the plurality of tubes 110 and flows through the plurality of tubes 110 via the inlet box 120 and the inlet manifold 140.
Meanwhile, a portion of the cooling water, which has circulated through a water jacket (not shown) of the cylinder block 30, is introduced into the mounting space 31 through a cooling water inlet 33 formed at the cylinder block 30.
The exhaust gas flowing through the plurality of tubes 110 is heat-exchanged with the coolant introduced into the installation space, and thus, the temperature of the exhaust gas is reduced.
The exhaust gas, the temperature of which is lowered by heat exchange with the coolant, is temporarily collected from the plurality of tubes 110 to the outlet tank 130 through the outlet manifold 150. The exhaust gas temporarily collected in the outlet tank 130 is discharged to the EGR line via the outlet pipe 180 and the outlet flange 190 mounted on the cover plate 160.
This application claims priority from korean patent application No. 10-2018-0155998, filed on 6.12.2018 with the korean intellectual property office, the entire contents of which are incorporated herein by reference.
While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (19)

1. An exhaust gas recirculation cooler comprising:
a cylinder block having an installation space and having a coolant inlet through which coolant can flow into the installation space and a coolant outlet through which coolant can be discharged;
a cover plate covering the installation space and forming an exhaust gas inlet through which exhaust gas can flow and an exhaust gas outlet through which exhaust gas can be discharged;
a plurality of pipes installed in the installation space and through which exhaust gas can flow;
an inlet box installed in the installation space and configured to distribute the exhaust gas flowing through the exhaust gas inlet of the cap plate into the tubes; and
an outlet box installed in the installation space and configured to guide the exhaust gas discharged from the pipe to the exhaust gas outlet of the cover plate.
2. The exhaust gas recirculation cooler according to claim 1, wherein the plurality of tubes are stacked in a left-right direction and an up-down direction.
3. The exhaust gas recirculation cooler of claim 2, further comprising spacers formed on an outer surface of the tubes to maintain a constant distance between the plurality of tubes.
4. The exhaust gas recirculation cooler of claim 1, further comprising an outlet manifold forming a plurality of tube outlet holes corresponding to the plurality of tubes, the outlet manifold being disposed between the plurality of tubes and the outlet tank, wherein exhaust gas is dischargeable from the plurality of tubes to the outlet tank.
5. The exhaust gas recirculation cooler of claim 4, further comprising: a manifold outlet insert portion for mounting the outlet manifold; and an outlet tank hole communicating with the exhaust gas outlet of the cover plate formed in the outlet tank.
6. The exhaust gas recirculation cooler of claim 1, wherein:
an inlet manifold forming a plurality of tube inlet holes corresponding to the plurality of tubes, the inlet manifold being interposed between the plurality of tubes and the inlet tank, and
the exhaust gas can be distributed from the inlet box to the plurality of tubes.
7. The exhaust gas recirculation cooler of claim 6, further comprising: an inlet tank bore in communication with the exhaust gas inlet of the cover plate; and a manifold inlet insert portion for mounting the inlet manifold formed in the inlet box.
8. The egr cooler according to claim 1, wherein a head bending portion that is bent toward the opposite side of the cylinder block is formed on an outer side of the cover plate.
9. The egr cooler according to claim 1, wherein a guide protrusion is formed to guide a flow of the coolant, the guide protrusion protruding toward the mounting space.
10. The exhaust gas recirculation cooler according to claim 1, wherein a plurality of protrusions protrude toward opposite sides of the installation space to prevent noise generated at an engine from being transmitted to the outside.
11. The egr cooler of claim 1, further comprising a gasket disposed between the cover plate and the cylinder block.
12. The exhaust gas recirculation cooler of claim 1, further comprising:
an inlet duct mounted in the exhaust gas inlet of the cover plate; and
an outlet duct mounted in the exhaust gas outlet of the cover plate.
13. The exhaust gas recirculation cooler of claim 12, wherein the inlet duct and the outlet duct are formed with a corrugated bellows shape.
14. The egr cooler of claim 12, further comprising:
an inlet flange mounted to the inlet duct; and
an outlet flange mounted to the outlet duct.
15. An engine system, comprising:
an engine comprising a plurality of combustion chambers;
an intake line through which intake air can be supplied to the combustion chamber;
an exhaust gas line through which exhaust gas discharged from the combustion chamber can flow;
a catalytic converter in-line with the exhaust gas line;
a turbocharger including a turbine provided in the exhaust gas line and configured to be rotated by exhaust gas discharged from the combustion chamber, and a compressor that rotates in cooperation with the turbine;
an exhaust gas recirculation device, the exhaust gas recirculation device comprising: an exhaust gas recirculation line branching off from the exhaust line downstream of the turbine and coupled to the intake line upstream of the compressor; an exhaust gas recirculation cooler disposed at the exhaust gas recirculation line; and an exhaust gas recirculation valve provided at a position where the exhaust gas recirculation line and the intake line are coupled, wherein the exhaust gas recirculation cooler includes:
a cylinder block having an installation space and having a coolant inlet through which coolant can flow into the installation space and a coolant outlet through which coolant can be discharged;
a cover plate covering the installation space and forming an exhaust gas inlet through which the exhaust gas can flow in and an exhaust gas outlet through which the exhaust gas can be discharged;
a plurality of pipes installed in the installation space and through which exhaust gas can flow;
an inlet box installed in the installation space and configured to distribute the exhaust gas flowing through the exhaust gas inlet of the cap plate into the tubes; and
an outlet box installed in the installation space and configured to guide the exhaust gas discharged from the pipe to the exhaust gas outlet of the cover plate.
16. The engine system of claim 15, wherein the exhaust gas recirculation device is a low pressure exhaust gas recirculation apparatus.
17. The engine system of claim 15, wherein the exhaust gas recirculation device is a high pressure exhaust gas recirculation apparatus.
18. The engine system of claim 15, wherein the exhaust gas recirculation cooler further comprises a plurality of spacers arranged to maintain a constant distance between the plurality of tubes.
19. The engine system of claim 15, wherein the exhaust gas recirculation cooler further comprises an inlet manifold forming a plurality of tube outlet apertures corresponding to the plurality of tubes, the inlet manifold being disposed between the plurality of tubes and the inlet tank.
CN201910823346.4A 2018-12-06 2019-09-02 Exhaust gas recirculation cooler Pending CN111287870A (en)

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KR1020180155998A KR102738513B1 (en) 2018-12-06 2018-12-06 Egr cooler
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US20200182201A1 (en) 2020-06-11
US10794337B2 (en) 2020-10-06
KR20200068977A (en) 2020-06-16
KR102738513B1 (en) 2024-12-04

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